<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!--提示区域 -->
      <el-alert title="消息提示的文案" type="info" center show-icon></el-alert>

      <!-- 步骤条区域 -->
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息" name="0"></el-step>
        <el-step title="商品参数" name="1"></el-step>
        <el-step title="商品属性" name="2"></el-step>
        <el-step title="商品图片" name="3"></el-step>
        <el-step title="商品内容" name="4"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- 左侧tab栏 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
      >
        <el-tabs
          :tab-position="'left'"
          @tab-click="tabClicked"
          v-model="activeIndex"
          :before-leave="beforeTabLeave"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                class="cao"
                v-model="addForm.goods_cat"
                :options="catelist"
                :props="cateProps"
                expand-trigger="hover"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <el-form-item v-for="item in manyTableData" :label="item.attr_name" :key="item.attr_id">
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox border :label="cb" v-for="(cb, i) in item.attr_vals" :key="i"></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <el-upload
              class="upload-demo"
              :action="uploadUrl"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess"
            >
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品的按钮 -->
            <el-button type="primary" class="addBtn" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>

      <!-- 预览图片窗口 -->
      <el-dialog title="图片预览" :visible.sync="preveiewVisible" width="50%">
        <img class="previewImg" :src="preveiewPath" />
      </el-dialog>
    </el-card>
  </div>
</template>

<script>
import _ from "lodash";
export default {
  data() {
    return {
      // 同时控制tab栏和步骤条的进度
      activeIndex: "0",
      // 添加商品的表单数据对象
      addForm: {
        goods_name: "",
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 上传图片的路径数组
        pics: [],
        // 商品的详情描述
        goods_introduce: "",
        // 动态参数和静态属性列表;
        attrs: [],
      },
      // 表单的校验规则
      addFormRules: {
        goods_name: [
          { required: true, message: "商品名称能为空", trigger: "blur" }
        ],
        goods_price: [
          { required: true, message: "商品价格不能为空", trigger: "blur" }
        ],
        goods_weight: [
          { required: true, message: "商品重量不能为空", trigger: "blur" }
        ],
        goods_number: [
          { required: true, message: "商品数量不能为空", trigger: "blur" }
        ],
        goods_cat: [
          { required: true, message: "商品分类不能为空", trigger: "blur" }
        ]
      },
      // 商品分类列表
      catelist: [],
      cateProps: {
        label: "cat_name",
        value: "cat_id",
        children: "children"
      },
      // 动态参数列表数据
      manyTableData: [],
      // 静态属性列表数据
      onlyTableData: [],
      // 上传图片的请求地址
      uploadUrl: "http://127.0.0.1:8888/api/private/v1/upload",
      // 上传图片携带token的请求头
      headerObj: {
        Authorization: window.sessionStorage.getItem("token")
      },
      // 预览图片的路径
      preveiewPath: "",
      // 控制预览图片窗口显示和隐藏
      preveiewVisible: false,
    
    };
  },
  methods: {
    // 获取商品分类参数列表
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg);
      }

      this.catelist = res.data;
    },

    // 级联选择器选中项变化, 会触发这个函数
    handleChange() {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = [];
      }
    },

    // 保证用户选择了三级分类才切换tab栏
    beforeTabLeave(activeName, oldActiveName) {
      // console.log('即将离开的标签页名字是:' + oldActiveName);
      // console.log('即将进入的标签页名字是:' + activeName);
      if (oldActiveName === "0" && this.addForm.goods_cat.length !== 3) {
        this.$message.error("请先选择商品分类!");
        return false;
      }
    },

    async tabClicked() {
      // 表示进入了商品参数面板
      if (this.activeIndex === "1") {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          { params: { sel: "many" } }
        );
        if (res.meta.status !== 200) {
          return this.$message.error(res.meta.msg);
        }

        res.data.forEach(item => {
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(" ");
        });
        this.manyTableData = res.data;
      } else if (this.activeIndex === "2") {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: "only" }
          }
        );

        if (res.meta.status !== 200) {
          return this.$message.error(res.meta.msg);
        }
        this.onlyTableData = res.data;
      }
    },
    // 图片预览效果
    handlePreview(file) {
      console.log(file);
      this.preveiewPath = file.response.data.url;
      console.log(this.preveiewPath);
      this.preveiewVisible = true;
    },
    // 处理移除图片的操作
    handleRemove(file) {
      // 获取将要删除图片的临时路径
      const filePath = file.response.data.tmp_path;

      // 从pics数组中找到这个图片路径所对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath);

      // 调用数组的 splice方法, 反图片信息对象, 从pice数组中移除
      this.addForm.pics.splice(i, 1);
      console.log(this.addForm);
    },
    // 监听图片上传成功的事件
    handleSuccess(response) {
      // 拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path };

      // 将图片信息对象, push到pics数组中
      this.addForm.pics.push(picInfo);
    },

    add() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error("请填写必要的表单项!");
        }
        // 执行添加的业务逻辑
        const form = _.cloneDeep(this.addForm);
        form.goods_cat = form.goods_cat.join(",");
        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {
            atte_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          };
          this.addForm.attrs.push(newInfo);
        });
        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_valus: item.attr_vals };
          this.addForm.attrs.push(newInfo);
        })
        form.attrs = this.addForm.attrs;
        console.log(form);

        // 发起请求添加商品
        // 商品的名称必须是唯一的
        const {data: res} = await this.$http.post('goods', form);

        if (res.meta.status !== 201) {
          return this.$message.error(res.meta.msg);
        }

        this.$message.success('添加商品成功!');
        this.$router.push('/goods'); 
      });
    }
  },
  created() {
    this.getCateList();
  },
  computed: {
    // 三级分类的id
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2];
      }
      return null;
    }
  }
};
</script>


<style lang="less" scoped>
.previewImg {
  width: 100%;
}
.addBtn {
  margin-top: 15px;
}
</style>